Ed Cone has a great piece in CIO Insight that covers enterprise social software and corporate blogging.
...This is technology that users don't have to wait for. Technorati Inc., a service that tracks weblogs, follows more than eight million personal sites. More than one million wikis have been downloaded from open-source sites, for use in organizing everything from design projects to conferences to lunch meetings. "For the first time since e-mail, users on a very large scale are learning a new writing interface," says Ross Mayfield, CEO of Socialtext Inc., a company that sells wiki and blog-like applications, and boasts 20 members of the Fortune 500 among its customers...
Users appear to be finding new ways to deploy these generic tools. A simple blog that begins as a project-management log for a small group can become a searchable knowledge-management repository when the project is done. Mayfield thinks blogs and wikis could lead to some grand accomplishments that are only beginning to come into focus. The success of Wikipedia, a Web-based encyclopedia created and edited by thousands of volunteers, suggests that companies might also engage in what Mayfield calls "collaboration at a profound scale."